Diffuse Esophageal Spasm
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References:

1) Adler DG, Romero Y. Primary Esophageal Motility Disorder. Mayo Clin Proc 2001;76:195-200 [PDF]

2) Spechler SJ, Castell DO. Classification of oesophageal motility abnormalities. Gut 2001;49:145-151 [PDF]